172 



the suture indistinct ; aperture suborbicular, gublunatec^ 

 sometimes inclining to oval, margin thickened within, 

 edge acute, pillar lip somewhat spreading, flattish. 

 Common. 



GENUS. ODOSTOMIA. FLEMING. 

 Conical, aperture ovate, peristome incomplete above, 



and furnished with a tooth on the pillar. 



O. UNIDENTATA. F.p.SW. TURBO U. Mont. p. 

 324. t. 21. f. 2. VOLUTA U. Lin. T. 8. p. 131. 

 D.p. 508. Conic, strong, smooth, glossy, suhpellucid, 

 white, the apex rather obtuse ; whorls five or six, not 

 much raised ; aperture suboval, outer lip plain ; pillar 

 with one tooth near the middle. 0,20..,. 0,09. Not 

 common, Margate, Salcomb Say. 



O. PLICATA. F.jp. 310. TURBO P. Mont. p. 325. 

 VOLUTA P.Lin. T. S.p. 131. D.p. 509. Strong, 

 conic, smooth, glossy, subpellucid, white, usually tinged 

 with purple or pink at the tip, with rather an obtuse 

 apex ; whorls five or six, not much raised ; aperture 

 suboval ; outer lip plain ; pillar with one tooth near 

 the middle. 0,20... 0,083. Devon, rare. General 

 appearance of Cina. Ullvae. 



0. SPIRALIS. F. p. 310. TURBO S. Mont. p. 322. 



